Watch new footage of the mysterious giant hole that opened up in Siberia as a scientific expedition — with the country’s Emergencies Ministry represented — reaches the remote site and looks inside. An explosion below the ground is currently thought to be the most probable explanation — but the date and cause remain unknown.

The hole sits around 2900km east of Moscow in a huge 640km stretch of permafrost with a wide variety of animal species and that is famous for archaeological discoveries including wooly mammoths. The zone is also of key strategic importance for Russian oil and gas production.

A 70cm layer of permafrost reportedly discovered around the edge of the hole — mentioned in the video — is puzzling given the amount of heat that would be expected to have been generated by an explosion of the magnitude necessary to create such a large crater. It is therefore possible that the remote site lay undiscovered for months if not years.

Members of the Russian Academy of Sciences are on the expedition and are said to be collecting samples of soil, air and water from the area. The hole reportedly has an outer diameter of around 60m and an inner diameter of around 40m. The depth is unconfirmed.

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The residents of Wenzhou, China, woke up last Thursday to discover that the inner city river had turned blood-red. Everyone is puzzled, as this has never happened before and nobody knows the cause yet.

China Radio International reports:

Inspectors from the Wenzhou Environmental Protection Bureau are taking samples and analyzing the cause of the incident.

The villagers pointed out that there wasn’t a chemical plant along the upper stream.

Local residents say the river was flowing normally at 4am, but it started to redden at around 6am, and in no time at all had turned as crimson as blood.

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